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Port hydra-evaluator from C++ to Rust, removing the last C++ executable from the project. The new implementation uses `sqlx` and `tokio`, matching the async patterns already established by hydra-queue-runner and hydra-builder. Build/packaging changes: - Remove all C++ dependencies from `subprojects/hydra/meson.build` - Add `subprojects/hydra-evaluator/package.nix` following the same per-binary pattern as `hydra-queue-runner` and `hydra-builder`: each Rust binary is its own derivation that builds against a fileset containing only its own crate, and `postPatch` strips the other Rust binary crates from the workspace `members` list so cargo doesn't try to load their (absent) manifests. Properly sharing the dep crates between these builds is left for later. - Add `evaluatorExecutable` option to the NixOS web-app module, matching how the queue runner and builder are discovered via their own modules - Clean up stale references in `hydra-tests/meson.build` and `dev-shell.nix` `JobsetRow` uses `i32` for `lastCheckedTime` and `triggerTime` to match the `INT4` Postgres schema (`sqlx` refuses to decode `INT4` into `i64`). Post-eval DB updates are wrapped in a transaction, as in the C++ original. The DBI parser supports `sslmode`/`sslrootcert`/`sslcert`/ `sslkey` that `libpq` understood natively in the C++ version; unknown parameters are warned about rather than fatal. Satisfy the crate's own `#![deny(clippy::pedantic)]` gate: - use `fs_err` per workspace `disallowed_methods` policy - replace `as`-casts with `try_from` (schema is `INT4`, saturate at `i32::MAX`) - collapse nested `if let` chains Co-authored-by: Jörg Thalheim <joerg@thalheim.io> Co-authored-by: Claude <noreply@anthropic.com>
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Port hydra-evaluator from C++ to Rust, removing the last C++ executable from the project. The new implementation uses sqlx and tokio, matching the async patterns already established by hydra-queue-runner and hydra-builder.
Build/packaging changes:
subprojects/hydra/meson.buildhydra-queue-runner/package.nixtosubprojects/rust-package.nixwith named outputs (queue_runner,builder,evaluator)evaluatorExecutableoption to the NixOS web-app module, matching how the queue runner and builder are discovered via their own moduleshydra-tests/meson.buildanddev-shell.nix